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Flight 370: Underwater drones find nothing after scouring half of search area

By Greg Botelho and Ed Payne, CNN
updated 11:15 PM EDT, Sat April 19, 2014
STORY HIGHLIGHTS
  • NEW: Underwater drone finishes 7th mission, still no trace of missing plane
  • NEW: Agency: Up to 11 aircraft, 12 ships to participate in Sunday's search
  • Flight 370 went missing 44 days ago; the search area has "narrowed," official says
  • "With every passing day, the search has become more and more difficult," he adds

(CNN) -- The underwater drone scanning for Malaysia Airlines Flight 370 finished its seventh mission Sunday, having covered about half its intended territory without finding any sign of the missing plane.

This has been the case for 44 days now, which seems like an eternity for the relatives of the 239 passengers and crew on board still hoping for a miracle or, at least, closure.

The Bluefin-21 drone started its eighth mission soon after the previous one ended Sunday morning, surveying the bottom of the southern Indian Ocean for traces of the Boeing 777.

These efforts may be a main focus of the search, but they aren't the only part.

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Australia's Joint Agency Coordination Centre announced Sunday morning that up to 11 military aircraft and 12 ships will participate in the day's search. They'll be looking in two zones that, together, encompass about 18,700 square miles (48,500 square kilometers).

A day earlier, acting Malaysian transport minister Hishammuddin Hussein said that "experts have narrowed down the search area."

But are they actually closer to finding anything? Hishammuddin conceded, "it's difficult to say," adding the search "is at a critical juncture."

"I appeal to everybody around the world," he said, "to pray and pray hard that we find something to work on over the next couple of days."

The failure to find clues to the plane's disappearance does not mean that the operation will stop, only that other approaches -- such as a wider scope or the use of other assets -- may be considered, Hishammuddin told reporters. "The search will always continue."

Still, he said, "With every passing day, the search has become more and more difficult."

Mother Nature isn't making this task much easier.

Tropical Cyclone Jack is circulating northwest of the search area. And while it won't hit directly, this system should increase winds and rains on Sunday into Monday.

Passengers' relatives list questions

It was early on March 8 when Flight 370 set off from the Malaysian capital of Kuala Lumpur, destined for Beijing.

A policewoman watches a couple whose son was on board the missing Malaysia Airlines Flight 370 cry outside the airline's office building in Beijing after officials refused to meet with them on Wednesday, June 11. The jet has been missing since March 8. A policewoman watches a couple whose son was on board the missing Malaysia Airlines Flight 370 cry outside the airline's office building in Beijing after officials refused to meet with them on Wednesday, June 11. The jet has been missing since March 8.
The search for Malaysia Airlines Flight 370
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Photos: The search for Malaysia Airlines Flight 370 Photos: The search for Malaysia Airlines Flight 370
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The plane never made it.

What happened has been a confounding mystery, with passengers family members' frustrations compounded by a scarcity of details from authorities.

New ones that have come out six weeks later may help round out the picture but don't answer the main question: Why did the plane go off course, and where is it now?

These recent developments include a senior Malaysian aviation source's assertion that the jetliner deviated from its flight path while inside Vietnamese airspace.

It turned left, then climbed to 39,000 feet -- below its peak safe limit of 43,100 feet -- and maintained that altitude for about 20 minutes over the Malay Peninsula before beginning to descend, the source said.

Malaysia Airlines has declined to answer CNN questions on various matters -- including the fact that, according to the source, the missing jet was equipped with four emergency locator transmitters. When triggered by a crash, ELTs are designed to transmit their location to a satellite.

Relatives of people aboard the jetliner have drawn up 26 questions that they want addressed by Malaysian officials, who are to meet with them next week in Beijing. Most of the Flight 370 passengers and crew were Chinese.

Among them: What's in the flight's log book? Can they review the jet's maintenance records? Can they listen to recordings of the Boeing 777 pilot's conversations with air traffic controllers just before contact was lost?

Hishammuddin has defended his government's handling of the operation and accused members of the media of focusing on the Chinese families. He said relatives of passengers and crew from other nations represented have not had problems.

"The most difficult part of any investigation of this nature is having to deal with the families," he said.

CNN's Aaron Cooper, Tom Watkins, Todd Borek, Pamela Boykoff, Mitra Mobasherat, Ivan Watson, Brian Todd, Elizabeth Joseph and Erin Burnett contributed to this report.

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